Abstract—The experiments have been carried out on the acquisition of thermochemical remanent magnetization (TCRM) in recent Kamchatka basalt containing grains of primarily magmatogene titanomagnetite (TM) with increased thermal stability by rapid heating of the initial samples in air to maximum temperatures of 500, 570 and 600°C followed by cooling at a rate of 1°C/h in the magnetic field of 50 μT. Thermal stability of single-phase oxidized TM fraction manifested itself in the appearance of a wide range of blocking temperatures from 270 to 540–570°C concentrated within two or three intervals of differently inclined linear segments on the Arai–Nagata diagrams. The integrated analysis of the results of this and our previous studies of TCRM acquisition in TMs has shown that when TCRM is created through the growth of the Curie temperature of the cells of TM oxy-exsolution structure as their composition approaches that of magnetite provided that their volume has been stabilized, TCRM proves to be close to the thermoremanent magnetization. This gives grounds to consider the paleointensity determinations obtained on these samples reliable. In other cases, the paleointensity determinations overestimate (for the low temperature segment (from 200 to 375–450°C) of the Arai-Nagata diagram) or underestimate the intensity of the magnetizing field. It is also concluded that the presence of a wide range of blocking temperatures may indicate thermochemical origin of remanent magnetization.
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The work was carried out in partial fulfillment of the state contract with Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences and supported by the Russian Foundation for Basic Research under project no. 20-05-00215.
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Gribov, S.K., Shcherbakov, V.P., Tselmovich, V.A. et al. Properties of Thermochemical Remanent Magnetization on Basalt Samples Containing Titanomagnetites with Increased Thermal Stability. Izv., Phys. Solid Earth 58, 842–858 (2022). https://doi.org/10.1134/S1069351322060039
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DOI: https://doi.org/10.1134/S1069351322060039